Fix hotkey capture corrupting Option combos into unparseable accelerators (v0.1.17)

[archdex-art]

Root cause — from the user's own live log

WARN Global shortcut registration failed, retrying attempt=1 error=Some("Found empty token while parsing hotkey: Alt+\u{a0}") shortcut=Alt+
WARN Global shortcut registration failed, retrying attempt=2 ...
ERROR Failed to register global shortcut after retries error=Found empty token while parsing hotkey: Alt+ shortcut=Alt+
WARN Registered the default shortcut instead and persisted the correction fallback="Alt+Space"

settings.json's toggle_shortcut was "Alt+\u00A0" — Alt followed by a non-breaking space (U+00A0), not the literal string "Space". General.tsx's toAccelerator() built the accelerator from KeyboardEvent.key (the composed character). macOS recomposes many keys under Option into a different Unicode character than what's printed on the keycap: Option+Space's key is U+00A0, not " "; Option+letters compose accented characters (Option+C → "ç"). The capture UI displayed "Alt+Space" (fine, that's a static label) but the value it persisted was built from the corrupted composed character — invisible until the next registration attempt rejected it outright.

The 0.1.15/0.1.16 boot-time self-heal already recovered the hotkey back to the default (confirmed: settings.json on the user's machine already reads Alt+Space again after that log), but the underlying capture defect means rebinding to any Option combo reproduces the exact same corruption every time.

Fix

toAccelerator now resolves letters/digits/Space from KeyboardEvent.code (the physical key, unaffected by modifier-driven composition) instead of key, via a new codeToAcceleratorKey helper. Falls back to the existing key-based handling only for keys Option can't recompose (arrows, function keys, Escape, etc.), preserving all prior behavior for those.

Verification

• tsc --noEmit clean.
• Drove the real Settings UI in a browser and dispatched the exact synthetic event macOS actually sends for Option+Space (code: "Space", key: "\u00A0") — captured as Alt+Space, not corrupted.
• Same for Option+C (key: "ç") — captured as Alt+C.
• Bumped src-tauri/tauri.conf.json + Cargo.toml/Cargo.lock to 0.1.17, added CHANGELOG entry.